Can chickens' laying schedule occur at night?

I know chickens can have odd laying schedules and I do have a heat lamp on at night, but this just hasn't happened before. I found four eggs on Wednesday morning, none that afternoon, two on Thursday morning, and then three this morning. I haven't found any at night. I put them away between 6 - 8 pm, and they are let out at 6 am most of the time. Will they adjust to daytime? I worried the eggs might freeze.

I'm not understanding what you are asking, a chicken doesn't usually lay at night, and some don't lay everyday, those that do will lay about every 26 hours until it becomes late in the afternoon, then they will start laying in the morning again. You need to collect more frequently to avoid freezing eggs.

The only time I've had a chicken lay at night was with a young pullet that had just started laying. When they are on schedule, they will almost always lay during the day. As Old Hen Likes Dogs said, they have a 25/26 hour laying cycle. If it gets too late in the afternoon, they will skip a day and then pick up early on the next day they lay. If you can, it is a good idea to collect eggs frequently so they don't freeze or get broken.